Add Dutch language translation

[Nozem1982]

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[Nozem1982]

This PR adds:

1. translations/l10n_nl.xml
   Adds a complete Dutch translation (755 text keys, matching 1:1 with l10n_en.xml).

2. scripts/ADS_Main.lua — registerSpecializationToVehicles()
   Vehicles with the "pushHandTool" specialization (e.g. frontLoaderTransportDump
   from FS25_lsfmMiniAgriculturePack) also receive the "motorized" specialization
   through parent="baseDrivable", even though they have no actual engine. This
   caused ADS to incorrectly require a started motor before the player could push
   these carts. Fixed by explicitly checking for and excluding the "pushHandTool"
   specialization, regardless of vehicle type name.

3. scripts/ADS_Breakdowns.lua — LIGHTS_FAILURE effect
   Previously, the "lights off" effect on a dead battery (DEAD_BATTERY) or severe
   wiring corrosion only disabled the main light mask (position/low/high beam,
   work lights). Beacon lights run through a separate system in Farming Simulator
   (spec_lights.beaconLightsActive / vehicle:deactivateBeaconLights()) and were
   never touched. Added: as soon as LIGHTS_FAILURE is active, beacon lights are
   now also disabled immediately and kept disabled continuously (every ADS update
   tick), so the player can't turn them back on while the failure is active.

These changes have not been tested in a running game session and have not been
reviewed or approved by the original author(s). Use at your own risk.